Copper above $3.00 after former workers torch dozens of buildings, vehicles at Freeport's Indonesia operations blocking access to world number two mine.
The miner, Africa's biggest gold producer, reported a loss of $176 million in the six months to June 30, compared to a profit of $52 million in the same period last year.
Measure is part of a broader plan to restore profitability at the division, which saw adjusted operating profit fell by 37% in the second quarter of this year.
Plans to extend the life of the Voisey's Bay nickel mine in northern Labrador by moving operations underground – already once delayed – are now on hold.
Investors in Kingsgate Consolidated Ltd. (ASX:KCN) were allowed to gasp for air on Friday after being underwater on the stock due to problems with its mine in Thailand.
Only six of the top 20 producers are primary silver miners. The polymetallic ore deposits from which silver are recovered account for more than two-thirds of the world's silver resources.